THE ANALYSIS OF THE EFFECT OF MICROSTRUCTURE PARAMETERS ON THE ABILITY TO DEVELOP HIGH-STRENGTH STATES AND PECULIARITIES OF DEFORMATION BEHAVIOR OF Al 1570 ALLOY

The role of various microstructure parameters in developing the experimentally ultra- high strength of nanostructured aluminum-magnesium Al 1570 (Al-5.7Mg-0.32Sc-0.4Mn wt.%) alloy has been analyzed here. It was demonstrated that the main factors, which determined the alloy strength, are the grain size, the dislocation density and the segregation of magnesium atoms from the solid solution of the alloy into the grain boundary area. We have also received the cardinal values of the dislocation pinning stress by the magnesium atoms, as well as the stress conditioned by the material hardening as the result of dislocation interaction. The analysis of the deformation mechanisms has been resulted here too.